Of course I didn't mean literally "ARM OS". I meant OS running on ARM, which is different than OS running on x86, and can't run the same software.
If we are talking OS, which for me is a synonyme for "certainly not windows", then literally yes not the SAME (because compiled x86 software won't run on arm), but from user experience NO. I'm running the same programms on my inter PC, my thinkpad and my cubox-i (ai64, i386, arm). Yes the same desptop, too!